Serial 39737
Not sure on the age but seems to be in the 1970s perhaps.
WM Ainsworth & Sons
Bubble levels have fluid
Back movement dial turns
North moves
Appears to be functioning properly (I don’t know how to use but the dials all move freely)
Minor scraping on the mirror
Wear as pictured
Nice leather case
Construction appears to be aluminum and brass
Includes leather belt case in nice shape. Could use some leather conditioner. Has a tear